FAUNA OF THE OUTER WESTERN AREA OF THE CHANNEL. 317 



At Position 59, one very young specimen, 7 mm. in diameter by 4 mm. 

 in height. On dead valve of Peden opercularis. 

 Sigmata numerous. Several of the slender oxea 

 were observed to be strongly centrotylote. 

 ,, vii., one, of irregular form, measuring 100 by 25 mm. Sig- 

 mata numerous. 

 „ 77, one large specimen. 

 Other examples, not retained, occurred at Positions 8, 14, 34, 43, 44, 

 68, 76 (a few), 78 (a few). 

 Depth, 42-52 fath. 



DENDORIGINAE, Topsent. 

 Dendoryx incrustans (Esper). 



At Positions 3 (five), 4 (two), 13 (one), 14 (one), 43 (one), 52 (one), 



60 (one), 64 (one). 

 Depth, 40-53 fath. 



The specimens varied in habit from that of a thin investment on 

 Inachus, Ccllaria, etc., to that of an irregular more or less massive 

 growth on Hydroids and other objects, the largest measuring 65 mm. 

 in height by 70 mm. in width. 



Dendoryx (lophon) nigricans (Bowerbank). 



At Positions 46 (one), 59 (one). 



Depth, 47-49 fath. 



Eidley and Dendy (31) united Bowerbank's four species ffalicJiondria 

 ixittersoni, H. scandens, H. hyndmani, and H. nigricans, as varieties of 

 the one species loattersoni, under the genus loiolion, which is distin- 

 guished by the presence of bipocilli as microsclera. Topsent (31) 

 objects to this, and particularly to the inclusion of ixtttcrsoni, on the 

 grounds that Bowerbank makes no mention of bipocilli occurring in 

 that species. I follow Topsent in treating loplion as a sub-genus of 

 Detidoryx, and refer the two specimens here considered to nigricans as 

 more nearly in conformity with Bowerbank's description of that form, 

 though in some particulars they vary from it. 



The specimen from Position 46 is a large one, of very irregular, partly 

 massive, partly branching and anastomosing growth, evidently attached 

 to Lepralia /(Aiosa and partly intermingled with a few hydroids. The 

 dimensions are about 140 mm, by 100 mm., the latter probably having 

 represented the height of the specimen, which was broken. That from 

 Position 59 formed an irregular spreading growth on a fragment of a 

 Mactra valve, measuring 25 by 20 mm. in extent. Both examples are 

 of a soft spongy texture, with irregular corrugated surface, and dark 

 purplish brown in colour. 



